highaltitude.log.20150831

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[07:47] <eroomde> morning
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[08:06] <RealBorg> https://www.youtube.com/watch?v=1wiJWIfpQMU <- awesome, sfw
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[08:13] <Vaizki> he's smoking in a helicopter? :D
[08:16] <eroomde> that's a man who's never without a big fat cigar
[08:16] <eroomde> phsychologically anyway
[08:18] <RealBorg> Vaizki, I recently watched documentaries on the apollo and space shuttle programs
[08:18] <Vaizki> didn't have sound on at first, thought he must be australian
[08:19] <RealBorg> it was amazing to see how many nasa personell were smoking in the control room - cigarettes, tobacco pipes, cigars
[08:19] <Vaizki> RealBorg, yes I know they smoked in the mission control.. a lot.. but they don't anymore :)
[08:20] <RealBorg> and they didn't achieve anything significant anymore
[08:20] <eroomde> although i dislike wearing a suite i wouldn't mind having a strictly enforced apollo dress code
[08:20] <RealBorg> wonder if the could be more than a statistical correlation
[08:21] <RealBorg> s/the/there/
[08:22] <RealBorg> humanity was on the moon by the end of the 60's
[08:22] <eroomde> a pet theory some of us have is that that was peak utility for a good engineering mind
[08:22] <eroomde> you were brought up without computers
[08:22] <eroomde> you can do an awful lot in your head rather than having to have numpy or scipy there to save you
[08:22] <RealBorg> by 2015 it's back to low earth orbit - something accomplished by the russians by 1961
[08:22] <eroomde> but then you also had computers that could automate a lot of repetitive calculations
[08:23] <eroomde> so you have the combo of a very well-trained mind with the power of automated computation
[08:23] <eroomde> no we use computers as a crutch too much
[08:23] <RealBorg> yeah, I always used my computers as tools
[08:24] <eroomde> i'm on irc now
[08:24] <eroomde> thus, i don't
[08:24] <RealBorg> but when I look at people an the streets today, almost always looking at their smartphones
[08:24] <RealBorg> loosing even situational awareness
[08:25] <SpacenearUS> New vehicle on the map: 03ZN99 - 12http://tracker.habhub.org/#!qm=All&q=ZN99
[08:27] <RealBorg> I believe a good engineers mind works like a holodeck - make up and imagine something and run simulations
[08:27] <RealBorg> that's how einstein came up with his theory of relativity
[08:30] <eroomde> mmm. i also thing the internet sucks up a lot of that mind-churching time
[08:30] <eroomde> which i resent
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[09:02] <RealBorg> the internet can be a great resource or a bog your mind with tinfoil-content
[09:02] <eroomde> small doses
[09:03] <RealBorg> for example, you have nasa ntrs
[09:04] <eroomde> yes, it's good for finding papers
[09:05] <RealBorg> but if you look for cern on youtube, you find the official channel and lots and lots of tinfoil content
[09:05] <eroomde> sure, 90% of it is youtube and hackaday and other stuff with a very low SNR
[09:06] <eroomde> but it's there for you when you come to a brand new topic and want to get through the basics v quickly
[09:06] <RealBorg> I wonder how long it will take these doomsday-prophecies for sep. 23 to vanish after that date
[09:06] <eroomde> google scholar is the best thing about the net *but for* all the crap with most journal papers being behind paywalls
[09:08] <RealBorg> I'd like to declare these paywalls to be hindering human development
[09:10] <eroomde> yep
[09:10] <RealBorg> one can get tons of bullshit for free, but if you want science , you have to pay
[09:10] <eroomde> it's frustrating certainly
[09:11] <RealBorg> not because the scienties need to get paid (they do have to find other ways) but some publishers from the 19th century
[09:11] <eroomde> sometimes an academic will email you a pre-print copy of a pdf if you pay them
[09:11] <eroomde> er
[09:11] <eroomde> sorry
[09:11] <eroomde> brainfat
[09:11] <eroomde> if you email them
[09:12] <eroomde> as they're always keen for people to read their papers
[09:12] <RealBorg> thought about that, will try now :)
[09:12] <eroomde> but then that's harder in my field (rocket propulsion) because many of the authors are working for big commercial companies
[09:12] <eroomde> and a more hawkish
[09:12] <RealBorg> somehow I feel we are living in a jurassic world
[09:12] <eroomde> or worried about directly emailing a foreigner
[09:13] <RealBorg> i'd love to get my hand on "Low-Speed Aerodynamics" - but even the kindle edition is rather expensive
[09:15] <eroomde> i forget the name of the aerodynamics textbook i really like
[09:15] <eroomde> but as a non-aerodyanmicist i got a lot from it
[09:15] <eroomde> is the book you want by komerath?
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[09:19] <RealBorg> joseph katz
[09:20] <eroomde> http://rahauav.com/Library/Aerodynamic/Low_speed_aerodynamics_www.rahauav.com.pdf
[09:22] <RealBorg> fantastic, thanks a lot!
[09:22] <eroomde> np
[09:23] <RealBorg> good quote I recently heard: It's easy to explain how a rocket works, but it takes a rocket scientis to explain how an airplane works.
[09:25] <eroomde> you can normally dive as deep into any of these topics as you like
[09:25] <RealBorg> I want to build a plane model working based on electrohydrodynamic thrust
[09:26] <RealBorg> what do you think?
[09:27] <eroomde> i don't really know as much about non-chemical propulsion as people assume i would
[09:27] <eroomde> so if the physics work then i'd say go for it
[09:28] <eroomde> but i couldn't tell you if i does :)
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[09:28] <RealBorg> EHD-propulsion has a bad image because it is often claimed to be an anti-gravity device (lifters on youtube)
[09:29] <RealBorg> but using it as a horizontal propulsion for a wing would be something new
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[10:15] <SpacenearUS> New vehicle on the map: 03vk3tbc_chase - 12http://tracker.habhub.org/#!qm=All&q=vk3tbc_chase
[10:38] <M0XIN> Morning all
[10:38] <M0XIN> Great weather for flying today
[10:38] Action: M0XIN lies
[10:39] <fsphil> not often I can be smug about the weather in n.ireland :)
[10:39] Action: fsphil looks out at the sunshine
[10:40] <ulfr> huh huh
[10:40] <ulfr> it's raining here.
[10:40] <ulfr> Now I know where the sun went off too.
[10:41] <fsphil> don't worry. it won't stay here long
[10:44] <Laurenceb__> http://cs627129.vk.me/v627129907/10d63/z1gwBYpfAQ0.jpg
[10:45] <gonzo_> it didn't go anywhere, it just went off
[10:48] <ulfr> hehe
[10:48] <mfa298> I might need to post that link to work, we use lots of opensource stuff, and one of the owners has a Tesla
[10:48] <gonzo_> thoygh supprisingly, still getting power from the solar panels
[10:49] <gonzo_> I'd probably choose the home brew one. Looks far more fun.
[10:50] <gonzo_> And as a kit car owner.. "If you didn't build it, you are just traffic."
[10:50] <gonzo_> I do like the gate hinges and the little tower bolt on the door
[10:55] <chimpusmaximus> Gonzo_ what kit you got?
[11:01] <chimpusmaximus> https://goo.gl/photos/GgWxBrhSpXp1oVtz8 Spent far to much time on this
[11:04] <gonzo_> a vincent hurricane
[11:05] <gonzo_> not an absolutly genuine kit, as it uses a full chassis off the donor car
[11:05] <gonzo_> but at least keeps the original reg, hitiric status and easy MoT etc
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[11:06] <gonzo_> historic
[11:07] <chimpusmaximus> Nice
[11:09] <chimpusmaximus> Mate has 2 Davrians that worked on for past 8 years.
[11:11] <gonzo_> Only 8 yrs.. Just started then!
[11:12] <gonzo_> www.g0nzo.co.uk/misc/vincent.jpg
[11:12] <gonzo_> still very much work in progress
[11:16] <daveake> morn
[11:17] <chimpusmax_win> They always are
[11:19] <chimpusmax_win> Morning, lovely day for HAB
[11:19] <Vaizki> gonzo_, 404
[11:25] <chimpusmaximus> daveake: Was the vid camera from the Skyacedemy flight a gopro? If so what model?
[11:25] <daveake> 3 white
[11:26] <daveake> didn't want to risk my 4 silver :)
[11:26] <chimpusmaximus> ok cheers, results looked impressive
[11:26] <daveake> yeah the 4 is much, much better at close up
[11:27] <daveake> but no silly mascots this time :)
[11:27] <daveake> I think they started pulling the fixed focus in on the 3+ onwards
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[11:30] <chimpusmaximus> :-) got a 4 black but heat and power consumption worries me a bit. Torn currently between L91's or 18650s to keep it powered for over 3hrs.
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[11:31] <daveake> yeah I went for the silver as I was worried about the hea
[11:31] <daveake> t
[11:31] <chimpusmaximus> I found if i did not run it with internal battery in place it would run lower temp.
[11:31] <daveake> Unlike the earlier models 32GB isn't quite long enough for a flight even at 1920/1080/25
[11:31] <daveake> yeah good thinking
[11:32] <chimpusmaximus> Plan is 2.7k at 60fps. Did think go lower res and take photos as well.
[11:33] <chimpusmaximus> Either way going with a 128GB card so don't have to runny to much with run time.
[11:35] <mattbrejza> someone should have a go at machining a nice heatsink case for this thing
[11:35] <daveake> I'm pretty sure the 4's can pop out jpegs at set intervals whilst doing video
[11:35] <chimpusmaximus> I have to admit mine as never run as hot as the mobius i had.
[11:35] <mattbrejza> they cab
[11:35] <chimpusmaximus> i think its limited to 1440 res any higher and its just video
[11:36] <daveake> yeah I've not looked yet
[11:38] <chimpusmaximus> Power wise i did some tests with 3 x L91 and a pololu step up to power through usb, Seemed to work well but worried looking at temp vs capacity that it will drop off to much at high current draw.
[11:38] <HB9RSU> @eroomde maybe I can help with rocket propulsion and papers about that topic
[11:39] <chimpusmaximus> Also to be safe will need more than the 3A the 3 x L91 provide. Hence looking to 18650 or just 3x2 sets of l91.
[11:40] <chimpusmaximus> In past mind i founds the l91 generate their own heat with a higher current draw. Certainly with 6 powering a pi and mobius they always stayed warm.
[11:43] <chimpusmaximus> Or do people just use usb power packs with lithium ion batterie inside?
[11:43] <daveake> I've done the latter a few times; no problems
[11:43] <daveake> again the self heat is enough
[11:47] <HB9RSU> we used lithium io packs in the flight last Friday for the goPro and the Raspi
[11:48] <HB9RSU> one for GoPro and robe cutter and another for the raspi
[11:48] <chimpusmaximus> Sounds like i'm probably worrying more than i need in that area. Its not like any one gave me a weight saving.
[11:48] <chimpusmaximus> Thanks
[11:49] <HB9RSU> GoPro worked for more than 6hrs with a 10 Ah USB pack (together with the internal battery of the gopro)
[11:49] <daveake> I did a customer flight for a customer - a test flight before the real one - where they supplied the gopros and external batteries. The flight landed 17m up a tree so we went back the next day with longer poles. When :/we got the footage back it was all black. They'd set the gopros to "overwrite when full" and the batteries lasted into the night
[11:50] <HB9RSU> OMG :-)
[11:50] <Vaizki> ehhh
[11:50] <daveake> I didn't even know they had such a setting :p
[11:50] <Vaizki> yea it's for use as a dashcam
[11:50] <chimpusmaximus> lol
[11:50] <daveake> All we could see was a dot (the moon, or a nearby lamp, dunno) swinging around
[11:51] <chimpusmaximus> Always fancied a 4k dashcam..
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[12:19] <SpacenearUS> New vehicle on the map: 03BGS2 - 12http://tracker.habhub.org/#!qm=All&q=BGS2
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[12:45] <SpacenearUS> New vehicle on the map: 03CALLSIGN123_chase - 12http://tracker.habhub.org/#!qm=All&q=CALLSIGN123_chase
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[12:55] <eroomde> HB9RSU: oh?
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[14:10] <SpacenearUS> New vehicle on the map: 03compteach_chase - 12http://tracker.habhub.org/#!qm=All&q=compteach_chase
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[16:28] <jet> Hi all
[16:28] <jet> Cinematic video now released for Saturday's hermes launch
[16:28] <jet> https://www.youtube.com/watch?v=VqPQUU5txRI
[16:41] <eroomde> watched
[16:41] <eroomde> that's a v nicely put together video
[16:41] <eroomde> good flight
[16:43] <jet> Thanks :)
[16:43] <jet> 1 and a half days of compiling and editing
[16:44] <jet> Overall, 6 cameras were used to make that. Plus a phone.
[16:46] <jet> With the inception theme tune in the background, makes a lovely ending
[16:47] <eroomde> if you like hans zimmerman, yewp
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[16:57] <jet> All the preparation paid off! The quality of the bursting footage is insane
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[17:11] <Laurenceb__> seeed have fpc again
[17:11] <Laurenceb__> http://www.seeedstudio.com/service/index.php?r=fpcb
[17:11] <Laurenceb__> very nice
[17:13] <Laurenceb__> holy shit and $9 MOQ
[17:15] <Laurenceb__> at work we once paid £60k for a FPC order of 20 boards
[17:23] <mattbrejza> but $120 setup?
[17:24] <mattbrejza> (still much cheaper than £60k)
[17:27] <Laurenceb__> sorry i meant moq for rigid
[17:27] <Laurenceb__> $120 is still very cheap for flexi
[17:27] <Laurenceb__> my last fpc from china was twice that
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[18:37] <Lunar_Lander> evening
[18:38] <Indigaz> greetings
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[18:47] <Lunar_Lander> no tentative date for F2, but maybe in October
[18:52] <eroomde> what's on this flight?
[18:53] <Lunar_Lander> servo based cutdown, ntx2b, photodiode based payload rotation experiment and comparison of aspirated and non-aspirated T and U sensors
[19:05] <RealBorg> T and U sensors?
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[19:08] <Lunar_Lander> temperature and humidity
[19:08] <Lunar_Lander> for some reason humidity is called U in meteorology
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[19:17] <HB9RSU> How do you do the servo base cutdown? We have done that last Friday
[19:20] <Lunar_Lander> we made a small device where a pin made of perspex fits into a block of perspex
[19:20] <Lunar_Lander> then the servo pulls this pin back and then a sling of rope is released by that
[19:24] <Lunar_Lander> https://drive.google.com/file/d/0B1lke6hPHKJDTnNjM2RUeEdPSnc/view?pli=1
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[19:42] <HB9RSU> we used a turning excenter
[19:45] <HB9RSU> http://www.spl.ch/temp/EOS1/DSC_0085.JPG
[19:49] <HB9RSU> New pics from out Flight last Friday: https://www.facebook.com/spaceforeverybody
[19:53] <craag> spectacular landing site HB9RSU
[19:54] <eroomde> https://i.imgur.com/kt2XX0b.jpg
[19:54] <eroomde> yes it beats east anglia
[19:57] <Lunar_Lander> nice HB9RSU
[19:57] <HB9RSU> Recovering can be challanging in this area though
[19:59] <eroomde> we once made and flew a robotic airship to study the alps
[19:59] <eroomde> the first one crashed
[19:59] <eroomde> and recovery was indeed.... challenging.
[20:01] <HB9RSU> we were lucky. Lots of things could go wrong. we traversed many lakes and steep clifs
[20:02] <HB9RSU> cliffs
[20:03] <HB9RSU> Airship = blimp?
[20:04] <eroomde> yes
[20:04] <HB9RSU> cool
[20:04] <eroomde> first one died
[20:04] <eroomde> recoevered the computer pod
[20:04] <eroomde> 2nd one worked nicely
[20:09] <Lunar_Lander> HB9RSU, the mechanism looks nice and compact
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[00:00] --- Tue Sep 1 2015